#include<iostream> using namespace std; int main(){ int n; cin >> n; int g = n % 10; // 123 % 10 int s = n / 10 % 10; int b = n / 100 %10; int q = n / 1000 % 10; // 23456/1000=23 cout << g * 1000 + q * 100 + b * 10 + s << endl; return 0; }